Electric train signaling apparatus



t- 0, 1931- o. GRONDAHL ET AL 1,323,039

ELECTRIC TRAIN SI'GNALING APPARATUS Filed Nov. 5. 1930 P 0 503301142; Qua-W (77m) ATTORNEY.

v s 101.11 invention relatesitojeleetric train si gziinventiomxthe. coresz andwindingsei "naling app aratu's of the type disclosed and slgnedand: arranged 1th atv when; thisclaimed in application for 'Letters Patent of; L the? Vvo'ltagezinduced; injthe, winding '16 w ll ings 5, 5 and 6 are connected in series with a V traversed by a changing magnetic field cre h patented Oct. 20, 193i :ILA-RSYO. anon-neat, urrswnem; swarm-N.- B.c ssa1er, ;or Sw ss-Yeast}? i-ASSIGNQRSiE-Qz'lf mensw memeasremnca amar oaswtssvata PENNSYI VANIAgALGQBBORAT 4m or PENNSYLVANIA W i i nlnctrnrciml elhtjSlGNALING-ihrrARA'rUs" Ap1i1icati,on hammer 3 ,1930. aiah-1rd. 492,946.

the UnitedStates' filed by L. O. G-rondahl, on wequahand opposite ztO {the :sum ofj thepvoltages- May6,, 19.30, Serial $10,450,135, for electric i induced iniiwind-ings z5iand'5t sopthat whence train,signaling-system's.j-fOne feature of our lcont-act ;7,f7 i is: closed, substantially-n0; cur inventionis the arrangement of the apparatus wrent' willibe produced bytheiextcrior field inshown in the aforesaid application in such athereceiving;apparatus:compflsingsigwlgS manner that the apparatus will be immune to wandadevices-F. Theapparatus is; urthen V false operation by foreign fields. JdGSlgIldxthfite when contact-7T V, We will describe one form of apparatus em- -the :voltage priodu ced -.;in the couple bodying our invention,'and will then point zwin ding;ti-willgbegthey gnle as the;voltaj c out the novel features thereof in claims. .1ducedf,=in'.=-each .atra ck -rai1 1--;and by;;the;as-'

The accompanying drawing is a diagramsociatedwinding 5 or matic view showing one form of apparatus; e As helesho-wn, thtzfQl-egoingresfll isqiaca-iioa embodying our invention. ncomplisheda' by; providing w ndingsg 5 7 Referring to the drawing, the referencev w-jlthc theisamennllpilbfi zfifi$ 11 5: pliQviCling characters 1 and l designate the rails of 3,-l' W1n(1'1Il'g36. ;lVl1l/h twiceimarly k rn ias ithe railway track, and the reference character Q'"s;WlI1dl11.g; 5; 0125 53;and:,spaclngpthe cores gfIZQlIl designates the coupler of a train traveling on 'IQithGEf tIHQ lIfI'Q-HS and- -the coupler sothatthe1-'";7o a such track. The rest of the apparatus islet-voltage ind ced in the-couple'r ism-substantial mounted on the train. I p 7 1y equal to the voltage-induced-;ineaeh t a k The train-carried apparatus comprises two -sg a' lewhlf e GQI t Ct 'l S6 gThe fiance magnetizable cores 3 and 3 located above the,cjaiesulnm y fip fi l edby using thcfiarlntkllll m two track rails 1 and 1, respectively, and a V0.61? of'il lf is i W nding GafiS i hGfi h;wind ng'iioV third core 4 located beneath the coupler 2.

ndi faand-increas ng the-cros fsection 0f Cores 3 and 3 are provided with windings 5 ytheicor 4; The desiredr su1t mayfil g b 7 and 5, respectively, and core 4 is providedcacbi amqdn usinganydesiredqcross section with a winding 6. The three windings 5, 5 r 3-:l3h0 l2 .tggether gwith the vcor r espondand 6 are connected inseries, and these wind-1:5; gnumbenofturnsin :windingfi requiredito go ings are supplied'with alternating currentnp red cei svc tag insu t-whi h seql a from a enerator G when the normally open vzthcgifium-rokthe voltages ind d i th t w contact ?7 of a manually operable circuit ,llsi5la n f fy-"ia changing,magneticifield controller C, is closed. When this contact ism-1 Il i1I t -X. ri0I?-'circuit. 1 r H V closed, the currents which are induced in the. :pQlmLda-Qut above,,when contactfflfl track rails and in the body of the train at any one instant, all flow in the same direction.-;.-zz lfl lsmltlliligss gnals, theivoltage prodirq d- When the normally closed contact 7+7 of the C up is thevsame as that p du eac tr ck-rail; a qonsequently, gtheffield circuit controller 0 is closed, the three Wind-1' signaling device S through a suitable filter 'tance ay fro i h lfi Ch Sllc l-fo i xamp and amplifier F. i a ;oy ifl -fidla enttrack; is z reduced by the The apparatus as thus far described, is tj h' ;itheiield duegtowindingfi at the illustrated anddescribed in the application istantmili tri uhs an i lly halanq byrth by-L. O. Grondahl,referred to above. field duei-topwindingsfi,andj ,Apparatus os Assuming that the cores 3,3 and 4, are constructed-ginaccordancewithtourinvention wh n lva elitherefdre that.

eingiusediprtransniitt ng se s. eff (l m0 theireceiving,'circiiitt ofja train ated by current in a distant circuit, it will be observed that voltages will be induced in ;v

windings 5, 5 and 6.r In accordance with our noneanv afljaeent gtrackjis v Q 'Q- l Y close Leo duc d: y windings yfit ed at qme -1 i v i scope of our invention.

' scribed only one form of apparatus embodying our invention, it is understood thatvarious changes and modifications may be made therein within the scope of the appended" claims without departing from the spirit'and Having thus described our invention, what weclaimis: l I V 1; Trainsignalingapparatus of the type comprising three windings on a train disposed in inductive relationto the two track rails and a train coupler"respectively,gand

-' means for'at times connecting said windings in series with a' source of alternating current and for-at other times connectinglthem in series with a receiving device, said apparatus {beingcharacterized by the fact that the windr ing; associated with the coupler has twice as many turns aseach' of the other two windings, said windings being so spaced tromthe railsand the coupler that when they are connected withsaid source of alternating :cur-.

rent the electromotive force induced in the the further fact that the winding and core associated with the coupler are so spaced from the coupler that a series current in the three windings will induce equal voltages in the same direction inlthe coupler and in each track rail, I

4. Train signaling apparatus of the type comprising three windings on a train mounted oniron' cores and disposed in inductive relationto the two track rails and a train coupler respectively, characterized .by. the fact that the cross-section of the iron core associated with the coupler is such that the voltage produced in the winding on such core by a changing" magnetic field from an external source is equal tothe sum of the voltages produced in the windings associated with the track rails by the same magnetic field.

' In testimony whereof we afiix our s'igna tures. L a v V 'LARS 0.. GRONDAHL." PAUL N; BOSSART.

coupler is substantially equal to the-electro-- motive force induced in each rail, whereas,

the voltage induced in the coupler winding 7 bya changing magnetic field from an outside *sourceis equal and opposite to the sum of the voltages induced by the same field in the other two windings so that when thewindingszare with the receiving device such field connected has no efiect on the device. V a 2. Train signaling apparatus of 'the type 1 comprising three windings on a train dis-7' 140 A posed in inductive relation to the two track rails and a traincoupler respectively, and

" means for at times connecting said windings in series with a source of alternatlng current,

said apparatusbeing characterized by the alternating fact that the winding associated with the coupler has more turns than either-of the said windings being so spaced from the rails and thQ'COUPlGI that i when they are connected with'said sourceot current the electroniotive force induced in the coupler is substantially equal coupler 1 respectively; 'jtact that the size 60 duced there Train signaling apparatus; of the type relation to the two track rails and atraiu characterized by the of umber of turns of the winding associated iftofthe electromotive force inducedin-each': rail,

comprising three windings onfa train'mountto I- ed on iron cores and disposed ininductive the iron core 'andthe' with the coupler is such that the vcltage' inby a changing magnetic field v f-from an external source is equalandgpposite; to the sum' of the voltages induced by'the same field in the other two'windingsyandb f I I Q i 

